单项选择题 You are the network administrator for Fabrikam， Inc. Your network consists of a single Active  Directory forest that contains one domain named fabrikam.com. The functional level of the forest is  Windows Server 2003. Fabrikam， Inc.， acquires a company named Contoso， Ltd. The Contoso， Ltd.， network consists of a single Active Directory forest that contains a root domain named contoso.com and a  child domain named usa.contoso.com. The functional level of the forest is Windows 2000. The functional level of the usa.contoso.com domain is Windows 2000 native. A business decision by the company requires the usa.contoso.com domain to be removed. You need to move all user accounts from the  usa.contoso.com domain to the fabrikam.com domain by using the Active Directory Migration Tool. You  need to accomplish this task without changing the logon rights and permissions for all other users. You  need to ensure that users in usa.contoso.com can log on to fabrikam.com by using their current user names and passwords.  What should you do？（）

单项选择题 You have a single Active Directory directory service domain. You have three Active Directorysites. Site replication is scheduled to occur during business hours only. You plan to make a schema change after business hours. You need to ensure that replication occurs for all sites during the schema change.   What should you do？（）

单项选择题 Your company has a single Active Directory directory service forest with three domains. You plan to modify the Active Directory schema. You need to identify the schema master for the forest.  What should you do？（）